No coin nor oath required. For personal study only.
In a nine-month period, fifty patients have submitted to magnetic resonance evaluation of their kidneys. All studies were performed on the Siemens' Magneto& a 0.5 Tesla proton NMR imaging system utilizing a liquid helium and nitrogen-cooled superconducting magnet operating at a nominal field strength of 0.352 Tesla. The radiofrequency system operates at 15 mHz. Our renal MR protocol usually consists of two sets of 1 cm axial sections weighted one each towards maximizing T1 and Tp contrast. The TI set usually consists of a repetition time of .5 seconds with simultaneous echo acquisition of 35 and 70 msec. It takes 4.3 minutes to obtain five slices with this sequence. Our T2-weighted sequence usually consists of a repetition time of 2.1 seconds with simultaneous echo acquisition of 35 and 70 msec. It takes approximately 18.1 seconds to obtain seven slices with this sequence. Coronal sections have been found particularly useful in evaluating the kidney and particular, the relation of renal lesions to the surrounding perinephric structures and adrenal glands.
The normal appearance of the kidneys on T1 and T2-weighted sequences will be discussed. On Tl-weighted sequences, striking cortical medullary differentiation is usually obtainable with hypointense renal medually tissue noted on a background of midrange intensity renal cortex.
Renal vascular and collecting system structures tend to demonstrate a very hypointense appearance on TI images.
On T2-weighted images, this corticomedullary differentiation is usually lost with a generalized marked increased intensity of the entire renal parenchyma.
π SIMILAR VOLUMES
## Abstract ## Purpose To evaluate magnetic field interactions for 109 different biomedical implants and devices in association with exposure to a 3.0βTesla magnetic resonance (MR) system. ## Materials and Methods A total of 109 implants and devices (aneurysm clips, 32; clips, fasteners, and sta
## Abstract The purpose of this investigation was to evaluate the diagnostic capabilities of magnetic resonance imaging (MRI) performed using a dedicatedβextremity MR system in detecting lesions of the rotator cuff and glenoid labrum. This retrospective study compared the MR results obtained in 47